岩土工程学报2024，Vol.46Issue(10)：2019-2029,11.DOI:10.11779/CJGE20230955
碱渣轻质土路基填筑应用试验研究
Experimental research on application of alkali residue-based lightweight soil subgrade filling
摘要
Abstract
The alkali residue(AR)is a waste byproduct generated during the soda production process using the ammonia alkali method,leading to significant environmental pollution in soil,air and water as a result of its extensive accumulation.The proposed technology and method for producing alkali residue-based lightweight soil(A-LS)with AR is designed to facilitate the efficient reuse of AR.The feasibility of the proposed method is substantiated through the indoor trials and field-filling tests.This study involves an experimental analysis to determine the material proportion and preparation method for A-LS.The compressive strength tests,shear tests,CBR tests,dry-wet cycle tests,freeze-thaw cycle tests and field filling tests are conducted to investigate the mechanical properties,durability and road performance of A-LS.The findings demonstrate that the compressive strength,secant modulus,shear strength and CBR increase with the increase of wet density.These properties exhibit an upward trend with the extension of age.A-LS exhibits remarkable resistance to dry-wet and freeze-thaw cycles,boasting excellent durability.A-LS is applied to the X204 bridgehead of Xuwei-Guanyun section of Lianyungang-Suqian Expressway.The field-filling tests demonstrate that A-LS meets the design and specification requirements in terms of the compressive strength,CBR,resilient modulus and deflection.A-LS demonstrates exceptional capacity to absorb significant quantities of AR waste,resulting in a remarkable reduction of 70%in the usage of the ordinary Portland cement.This substantial reduction in ordinary Portland cement signifies a substantial decrease in carbon emissions.A-LS boasts several noteworthy attributes,encompassing simple process,economic and environmental protection,adjustable density and strength,and wide application range.A-LS exhibits a good application prospect.关键词
碱渣/碱渣轻质土/力学性能/耐久性/路基填筑Key words
alkali residue/alkali residue-based lightweight soil/mechanical property/durability/subgrade construction分类
建筑与水利引用本文复制引用
刘松玉,王正成,吴恺,杜广印,汪建斌,陈加富,江舜根..碱渣轻质土路基填筑应用试验研究[J].岩土工程学报,2024,46(10):2019-2029,11.基金项目
国家自然科学基金面上项目(42277146) （42277146）
江苏省交通工程建设局科技项目(7621009140) （7621009140）
江苏省研究生实践创新计划项目(SJCX23_0074) （SJCX23_0074）
